Hi Peter,
master_rendering_timeout was set to 10 minutes, so rendering jobs that took 11 minutes were killed and restarted so they never finished. I increased this to 15 minutes now, restarted tirex and added the z0-6 tiles for all styles, just to see how long they'll take to render.
I see that right now it's rendering my qa- and qai-styles. I changed them some days ago to not render anything from z0-z9 (maybe I'll even put that up to z13 or something) - so if you reload the styles from ~ti/styles, the queue should be a lot shorter/faster.
Regards, Thomas